The Medaka Box anime generally follows the manga. There might be a few minor differences here and there for animation purposes, but it doesn't stray too far from the original storylines and character traits.
I'm not entirely sure specifically what'medaka all fiction' is about without more context. It could potentially be a collection of fictional works related to something named Medaka, perhaps a character, a place, or a specific genre within the Medaka universe.
Searching for a very specific fanfic like one about Zenkichi Medaka being pregnant can be a bit of a challenge. Fanfic writers often come up with all sorts of creative ideas, but not all of them are easy to find. You could start by looking at the most popular fanfic websites dedicated to the source material that Zenkichi Medaka is from. Check the tags and search functions carefully, and you might get lucky and find what you're looking for.
Another theme could be self - discovery. Medaka coming from her own world and Naruto from his, when they interact, they start to see new aspects of themselves. For example, Medaka might learn about the value of teamwork in Naruto's world, which makes her reevaluate her own beliefs and skills. And Naruto might learn from Medaka's confidence and determination.
Well, 'Medaka Box Light Novel' is about this story where Medaka is like a super - capable student in the school. She has this idea of granting the wishes of her fellow students. There are other characters too, some who support her and some who might be a bit of a hindrance. It's filled with all sorts of school - related adventures, like dealing with different clubs and the politics within the school. And there are also some elements of mystery and action as they face various challenges along the way.